Find the exact value of the trig function, csc(u + v) given that sin u = 5/13 and cos v = -3/5 (both u and v are in Quadrant 2). Enter your answer as a fraction instead of a decimal, when applicable. ​

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?